Wallrap
Diensten
€ 0,99 · Ontworpen voor iPad. Niet geverifieerd voor macOS.
Wallrap is an acoustic stud finder. It teaches your iPhone the carpenter's knock test — rap the wall, listen for the pitch shift, know whether you're tapping over a hollow drywall cavity or a solid stud underneath.
THE TECHNIQUE
Walls over a stud sound brighter and shorter. Walls over a hollow cavity sound lower and longer — like a small drum. A trained ear can hear it instantly. Wallrap measures it for you.
HOW IT WORKS
Wallrap listens through your iPhone's microphone, detects each knock by its amplitude envelope, takes a 50 ms FFT snapshot of the sound, and computes two features that separate hollow from solid: the spectral centroid (where the energy is) and the low-band-energy ratio (50–500 Hz vs everything up to 4 kHz). The classifier maps each knock onto a hollow → solid axis and reports HOLLOW, EDGE, or SOLID with a soft confidence ring.
CALIBRATION
Different walls (drywall, plaster, paneling, tile) ring differently. Calibrate once per wall: tap a place you know is hollow drywall, then tap a place you know is a stud or door frame. Wallrap learns your reference and uses it for every later knock. Recalibration takes about 15 seconds and is stored locally on your device.
TAP-AND-TRACE MODE
Hold your phone vertically and slide it slowly across the wall, knocking every couple of inches. Wallrap records the sequence and draws a horizontal strip showing the inferred stud locations — amber bands for solid, slate bands for hollow, purple bands for the edges where it's not sure.
WHAT WALLRAP DOES NOT DO
Wallrap is an estimate, not a precision instrument. It will not find every stud in your wall with sub-centimeter accuracy. It can be fooled by noisy environments, inconsistent knocking, very thick walls, plaster-on-lath, and metal studs. Confirm with a drill pilot hole or a hardware stud finder before driving large fasteners.
PRIVATE BY DESIGN
- No accounts, no ads, no analytics, no tracking, no subscription
- Audio is processed live on device and never recorded or uploaded
- Your calibration profile is stored on this device in UserDefaults
- Microphone permission is requested only when you tap Listen, Trace, or Calibrate; you can revoke it at any time in Settings → Privacy
ACCESSIBILITY
- VoiceOver labels on every interactive control
- Dynamic Type-friendly typography (system SF Pro rounded)
- Variable-intensity Core Haptics on every classified knock (stronger and crisper for solid, softer for hollow)
- Dark mode primary; cool slate base with warm amber accent
REQUIREMENTS
- iOS 17 or later
- iPhone or iPad with a working microphone
- $0.99 one-time purchase, no in-app purchases
Wallrap is a single-purpose utility for the DIYer who'd rather knock once than guess. Calibrate, listen, knock, build.
Beoordelingen en recensies
- Deze app heeft niet genoeg beoordelingen of recensies ontvangen voor een overzicht.
HEADLINE — Edge-Lock live stud-center finder. New Wallrap/Models/EdgeLock.swift: pure value type EdgeLockTracker (unit-testable, KnockRun/StudPredictor pattern) holding an ordered buffer of recent (index, Classification) knocks. Exposes enum CenterState { searching, approaching(side:solidRun:), edgeCrossed(EdgeKind), centered(confidence:) } computed from the trailing run: it finds the most recent contiguous high-confidence solid run, requires a flank (hollow/edge) immediately before AND after it (the leading hollow-to-solid and trailing solid-to-hollow edges), and takes the argmax-confidence s
De ontwikkelaar, Robert Corbin, heeft aangegeven dat volgens het privacybeleid van de app gegevens kunnen worden beheerd zoals hieronder beschreven. Ga voor meer informatie naar het privacybeleid van de ontwikkelaar .
Er worden geen gegevens verzameld
De ontwikkelaar verzamelt geen gegevens van deze app.
Toegankelijkheid
De ontwikkelaar heeft nog niet aangegeven welke toegankelijkheidsfuncties deze app ondersteunt. Lees meer
Informatie
- Grootte
- 3,8 MB
- Categorie
- Diensten
- Compatibiliteit
Vereist iOS 17.0 of nieuwer.
- iPhone
Vereist iOS 17.0 of nieuwer. - iPad
Vereist iPadOS 17.0 of nieuwer. - Mac
Vereist een Mac met macOS 14.0 of nieuwer én Apple M1-chip of nieuwer. - Apple Vision
Vereist visionOS 1.0 of nieuwer.
- iPhone
- Talen
- Engels
- Leeftijd
4+
- 4+
- Provider
Robert Corbin
- Robert Corbin heeft zich niet geïdentificeerd als een handelaar van deze app. Als je een consument bent in de Europese Economische Ruimte, zijn consumentenrechten niet van toepassing op overeenkomsten tussen jou en de provider.
- Copyright
- © 2026 Robert Corbin
